Olaizola is a Basque surname. Notable people with the surname include:
Aimar Olaizola (born 1979), Basque pelota player, known as Olaizola II, brother of Asier Ander Olaizola (born 1989), Spanish footballer Asier Olaizola (born 1975), Basque pelota player, known as Olaizola I Javier Olaizola (born 1969), Spanish footballer José Luis Olaizola (1927–2025), Spanish writer Julio Olaizola (born 1950), Spanish footballer Manuel Aierdi Olaizola (born 1967), Basque politician